Reactive atomization of silicon to form in situ oxide sintering aids
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Reactive Atomization of Silicon to Form In Situ Oxide Sintering Aids Y. WU, X. ZENG, E.J. LAVERNIA, and J.M. SCHOENUNG The present investigation demonstrated the feasibility of using reactive atomization to produce Si powder with in situ oxide sintering aids. With further process optimization, this powder may be an alternative starting material to the conventional, mechanically blended, Si-plus-oxide powder used to produce commercial sintered reaction bonded silicon nitride (SRBSN). In the reactive atomization approach, yttrium and aluminum additives were introduced into silicon metal during induction melting. Reactive atomization was accomplished using a N2-5 pct 02 mixture as the atomization gas. During atomization, oxygen in the atomization gas reacted with Y and A1 in the Si melt to produce Y203 and A1203, which act as in situ sintering aids. The reactive atomized powder demonstrated a Gaussian distribution with a mean diameter of 36/~m. The powder fines (
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